High-Performance Idlers for OEM Undercarriage Systems
In the heavy-duty sector, idlers are reliable undercarriage parts. These undercarriage parts ensure smooth redirection of the track from the sprocket to the front of the frame. DOZCO manufactures high-quality undercarriage parts for heavy equipment. This includes excavator idler wheels, along with front idler assembly and rear idler assembly for dozers, designed to guide the track chain and maintain proper alignment. The front idler is a large wheel at the front of the track frame. It acts as a pivot point, redirecting the track chain back toward the sprocket. A rear idler, on the other hand, is located at the rear of the undercarriage. It makes sure that the tracks are properly aligned and tight to avoid the risk of derailment during operation.
Key Features
Heat-treated for long wear life
Engineered for heavy-duty loads and shock absorption
Available in cast and fabricated versions
Designed to Meet International Standards
Understanding Idlers
- Key Components
- Maintenance Insights
Idler Shell
The idler shell is what is exposed to constant impact. Therefore, it is surface-hardened through induction to add strong wear resistance in challenging environments.
Shaft
The idler rotates around a stationary shaft. The shaft includes an internal oil reservoir that maintains continuous lubrication during operation.
Floating Seals
The seals are placed at each bushing end, designed to keep lubricant inside and contaminants like dirt and debris out. It often comes with optional rubber ring variations for better performance in different climate conditions.
Brackets
The shaft ends are mounted into heavy-duty brackets that enable free rotation. These brackets slide inside the track frame, supporting the recoil spring system and helping absorb shock loads, thereby protecting the undercarriage.
Bushings
Bronze bushings are pressed into the idler shell and rotate around the shaft. During rotation, oil forms a film between the bushings and shaft to reduce heat generation and friction that can lead to wear.
Toe-In / Toe-Out Misalignment
Toe-in or toe-out misalignment typically occurs due to a bent idler yoke or a distorted idler box section. These structural deformations can lead to uneven wear on the sides of the link rail, which over time also damages the idler flanges and the flanges of the first track roller. It is essential to thoroughly inspect the undercarriage components for any bends or warping. If the components are only slightly out of shape, they only need straightening. However, if structural recovery is not feasible, the idler yoke needs to be replaced to restore proper alignment and prevent further wear.
Lateral Displacement
Improper shimming during installation causes lateral displacement of the excavator idler wheel. When the shims are incorrectly adjusted, it can shift the idler sideways, causing excessive wear on the idler flanges, track links, and roller flanges. Over time, this misalignment causes additional stress on the track assembly, which impacts its longevity. Adjusting shims properly and maintaining a clearance of 0.5 to 1 mm between the guide plates and the track frame allows proper movement without causing misalignment.
Twist / Tilt Misalignment
Twist or tilt misalignment occurs if inner or outer support box sections are vented or from uneven wear on the idler wear plates. This can lead to abnormal wear patterns, especially on the idler flanges and the inner sides of the track link rails. Leaving it unattended can also impact other components of the undercarriage system. The primary option is to straighten the support box or yoke. In case that is not possible, it is recommended to proceed with component replacement.
Applications of Idlers
Specially engineered construction idlers offer better performance in Heavy-duty construction sites
Mining idlers are designed to withstand rugged mining operations
Suitable for infrastructure and earthmoving projects
Why Choose DOZCO Idlers for Your Undercarriage System
Heat-treated for long wear life
Engineered for heavy-duty loads
Available in cast and fabricated versions
Compatible with major OEM brands (e.g., Komatsu idlers)
Compatible Brands
(*OEM names or part numbers are for reference only.)Caterpillar, Komatsu, Volvo, Liebherr, Doosan, Kobelco, Sumitomo, Hitachi, Hyundai, YANMAR, CASE, John Deere, and more.
Caterpillar (CAT)
Komatsu
Hitachi
Volvo
Hyundai
Doosan
JCB